Never complain and never explain.
Be kind whenever possible. It is always possible.
Well done is better than well said.
Things do not happen. Things are made to happen.
It's always too early to quit.
Do not weep do not wax indignant. Understand.
If you're going through hell, keep going.
If you think you can do it, you can.
Expect problems and eat them for breakfast.
Always desire to learn something useful.
Without feeling abashed by my ignorance, I confess that I am absolutely unable to say. In the absence of an appearance of learning, my answer has at least one merit, that of perfect sincerity.